CVE-2026-20819 Windows Virtualization-Based Security (VBS) Information Disclosure Vulnerability

Api.Msrc.Microsoft • January 13, 2026

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Untrusted pointer dereference in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to disclose information locally.

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Multiple CVEs Affect Windows Virtualization-Based Security (VBS) Enclave Four vulnerabilities have been identified in Windows Virtualization-Based Security (VBS) Enclave, allowing both authorized and unauthorized attackers to disclose information or elevate privileges locally. The vulnerabilities include untrusted pointer dereferences and a heap-based buffer overflow, impacting the security of systems utilizing VBS. Specific CVEs include CVE-2026-20819, CVE-2026-20938, CVE-2026-20876, and CVE-2026-20935. 4 sources 49

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